wasnt for like 4 years
It is if you own a mining pool. Otherwise it is not really.
I thought u could mine for 3 years and still get nothing ?
Depends on how much you mine. Doge coin of all things was up a few months ago, friend cashed in an iphone 6 by mining on his old phone.
Electricity costs more than the bitcoin you receive.
However if you are in university halls etc (Power has a flat included rate) Then it's probably worth doing.
Depends. You're really not going to get anywhere with it unless you invest some serious $$ into the hardware capable of doing it efficiently.
Get informed about onecoin.
I got onecoin accounts to sell less than they are worth.(almost 50%)